The cap connectors are the components that used to be the back PCB holders. Since the PCB's are now fixed in another way, it is not necessary anymore to have the support from the cap connectors. The sole function of this part is know to connect the cap and skirts to the robot. The parts are 3D printed with PLA and all their holes are 3D printed as well. Having 3D printed holes is useful because it is easy to make and it works well. Nuts can be inserted from the side of the connector. These nuts make sure that it is easier to put screws in. It also makes sure that the screws keep better in place.